Voltage-regulating apparatus.



I s. PBCK & a. R. STUART. VOLTAGE. REGULATING APPARATUS.

AIPLIOATXO! TILED 001.- 13. 1901. to noun. HM"

I I I IZQQYENTU RS in: man, "runs a. wuminou. I-

PATENTBD SEPT. .29, 1903.

' 71min).

so. 74am,

UNITED STAT S Patented September 29, mos

PATENT, OFFICE,

JOHN S. DECK, OF PITTSBURG, AND H-AR'VE R. STUART, OF WILKINS BURG,

PENNSYLVANIA, ASSIGN-ORS TOWES'IINGIIO'USE ELECTRIC a MANUFAC- TURING COMPANY, A CORPORATION OF PENNSYLVANIA.

voL'rAc E-aeou LATING APeAaATus.

FPECIFICATION forming part of Lettersla teut No. 740,178, dated September 29, 1903s mama: lied mm 13.1902. emu In. 121.154. on model.)

To all whom it may concern:

Be it known that we, JOHN S. PECK, residiug at Pittsburg,'and nAR'vF. R. STUART, residing at Wilkiusburg, in the county of Alle-v gheny and Stateof Pennsylvania, citizens of the United States, have invented a new and useful Improvement. in Voltage-Regulating Apparatus, of which the following is especification.

Our invention relates to apparatus employed for raising orloweriug the voltages of alternating-current circuits; and it has for its object to provide simpleand eflioient apparatus for this purpose which shall be adapted for use in cnseswhere thocurrents are so large or the voltages are so high that they cannot be safely handled by the regulators ordinarily employed in such service;

Our invention is illustrated in the accomzo panyiug drawings, in which- V Figures 1, 2, 3, and 4 are diagrammatic illustrations of different forms of regulating apparatus. I

It is usual to eniployau adjustable. switching device for varying the active length of either the pri'maryor the secondary winding of a transformer in order to vary the electromotive force of the secondary circuit; but it is difiicult or impossible to obtain satisfactory results with apparatus of this character, particuiarly where the currents are very large or the voltages are very high, without making a greater number of divisions of the winding, the active length of which is to be varied, than is practicable. It is also a usual practice to vary the voltage'of an alternatingcurrent circuit by means of a regulator which acts inductively by making one of the members movable with reference to the other, and

0 thus adjusting the polar relations of the two members. S'uch apparatus is, however, expensive and canoniy be operated by the expenditure of a considerable amount of power,

from which it follows that a more simple and easily-operated device is desirable, provided sucha device. can be made effective and durable. 1

Our invention meets these requirements and will now he described in detail, reference 0 being {first had to Ifig. 1 of the drawings, in

. which theworking or distributing circuit 1 2 is supplied by the secondary 3 of a. transformer 4, the primary 3 of which is supplied by a circuit 5 6 and is provided with a so.- ries of spaced leads 7, which severally terminute in contact-terminals 8, mounted upon a suitablebasei). Pivotally mounted upon the base 9 are two switch-arms 10 and 11, which are respectively so mounted as to mnkesuccessive engagement with the contact-terminals 8 6e and are respectivelyconuected through asuitable reversing-switch ii to the terminals of the primary winding 13 of an auxiliarytrausformer 14, the secondary winding 15 of which is included in the conductorG of the primary orsupp-ly circuit.

that the winding 13 0f the auxiliary transformer 14 may be connected across different lengths of the primary winding 3 of the transformer 4, so that different voltages are impressed upon the said wizniiug 13, with the result thata varying Volta .5 obtained on the windiugl 5 and also upon me primary 8' of the main transformer,\vhieh in turn causes a variation in voltage on the secondary 3. The re: versing-swit'ch is employed in order to increase the rauge of voltage variation to double the amount which would be possible without its use; It is to be understood, however, that the reversiu-gswitch is not an indispensable feature of our invention, and it is to be further understood that a switching device having a single arm 9 or 10 will, serve our pur-- pose satisfactorily and be within the scope of our invention. I

While a simple adj usting-switch is shown for varying the active length of the winding 3 of the main transformer with reference to the auxiliary transformer and a separate re- 0 versing-switch is indicated, these two devices may in practice be made parts of asin- I I 'gle regulator, as is indicated, forexam'ple, in

Patent No, 607,617, granted July 11), 1898,to:\s the \V'estinghouse Electric d: Manufacturing 5 A Company as assignee of II. 1. Davis and G. Wright, and the structural details of the regulator meyahe such as the designer or user may desire.

It will be seen that this ar--- s rangement of apparatus and circuits is such In Fig. 2 the conductors 1, 2, 5, and 6, the r06 tt ansformer4,itswindi.ngs3 and 3 ,and the rearrangement of circuits the seoondary'volversingswitch 12 are ormay be thesame as the corresponding partsshown in Fig, 1. The-regulnting-switch is here showndiowevenashaving a sin le arm 10* for cooperating with the contact-terminals S, and this arm is connected through one side of the rcversingswitch with one terminal of the primary winding 13 of the auxiliary transformer 14, the other terminal of the winding 13 being connected through the reversing-switch with conductor 6 of the main primary circuit. ary winding 1-5 of the auxiliarytransformcr 14 has a plurality of spaced loads 16, which extend to corresponding contact-pieces 17 on the base .9. When the contact-arm l0 isin engagement with the outer or first contactterminnl of the set 17, both ends of the primary winding 13 of the transformer 14 are connected tothe outer terminal of the secondary winding 15, and the auxiliary transformer is therefore inactive. As thcnrm I0 is moved into engagement with the successive contact-terminals of the set 17 one terminal of the winding 13. is brought into elec trical connection with the corresponding points in the winding 15, whcrehythe vol tage impressed upon the winding 3- is correspondingly raised or lowered, according to the position of the reversing-switch. As the movement of the arm 10 is continued the transferable terminal of the winding 13'. is connected to the successive leads 7, whereby a variableelectromotive-t'orcc is impressed upon said winding, and this reacts upon the winding '15 in substantially the manner already described.

In Fig. 3 the apparatus is the same as that illustrated in Fig. 1, and the several parts are designated by the same reference-numerals, except as will be presently pointed out, and reference may be had, therefore, to the description of such parts which has already been given in lieu of repeating the same. In this organization of apparatus the winding 15 of the auiilia'ry transformer 1-1" is located in the secondary circuit of the main tranfor nerin series withthemain-transformer secondary winding and the other winding 13* of the auxiliary transformer is connected to the proper contact-terminals of the reversing-switch 12,-so that it may baconnected across different portions of the'pri mary windingof the main transformer as the arms 10 and 11 or either of them are moved to make engagement with different contactterminals 8. I

In Fig. 4 the apparatus is the same as in Fig. 3, except that the winding of the auxiliary transformer 14 which is included in sorie'svwith the secondary of the main transformer 4 is made in two parts 18 and 19, the former of which is included in the conductor 2 and the latter of which is included in the conductor 1 of thesecondarycircuit, the other winding 13 being connected the same as the corresponding winding in Fig. 3. With this The second-- tages are symmetrical with reference to any fixed point in" the secondary winding of the transformer-as, for example, the middle point-so that if athird conductor 20 be com nectcd to the middle point, as indicated, a balanced three-wire circuit is provided.

As has nlready'heon indicated, the regulating apparatusand-system here illustrated and described may be used in connect-ion. with a constant-potential source of energy in order to provide avariztblc voltage, or it may be used in connection-with a source of variable potential and be utilized to deliver it at either a constant or a variable voltage or for obtaining: a constant current from a constant-potential circuit. The invention is also-applicable to polyphase as well as singlephase circuits.

We claim as our invention- 1. In a voltage-regulating apparatus, the combination with a mam transfer-titer having one of its windings provided with loads e;- tend-iug from different points thereof and an auxiliarytransformer having one of its windings in series with one of thc-main-transformer windings, and an adjustable switching device for connecting-the terminalsof the other windingo'f theau'xilinry transformer with differentleads from the main-transformerwindmg.

2. In a voltage-regulator, the combination with a main transformer one of thewindings of which is provided with a pluraiityof leads and .an auxiliary transformer having one winding inserics with one of the windings of the main transformer, of a switching device for connecting the other winding of the anxiliary transformer in series with any desired portion of the length ofoneof-the main-transformer windings.

3. In a voltage-regulating apparatus, the combination with a main transformer having one of its windings provided with loads extending from different-points thereof and an auxiliary transformer having one of its wlndings in series with one of the main-trans former windings, of a reversing-switch connected to the other winding of the auxiliary transformer and an adjustable switching device for connecting the reversing-switch terminals with different leads from the maintransformer windin".

4. In a voltage-regulator, the combination with a main transformer one of the winding: of which is provided with a plurality of leads .aud an auxiliary transformer having one winding in series with one of the windings of the main transformer, of a switching device for connecting the other winding of the an:- iliary transformer in series with any desired portion of the length of one of the main-transformer windings and a switch for reversingthe terminal connections of the last-mentioned auxiliary-transformer winding.

5. In 3 vol tags-regulator, the combination with a main transformer one of the windings of which has plnmlity of spaced leads, of an anxilinrytranwi'ormel' having its windings connected together at" one end,v=one 0{ said winding-n having a plurality of spaced iends, and :i s iteln'nu' mini-ice comprising nonmet- !erminnls. for all of" said lesuls and a cooper- Ming. moi-able, contact-terminal.

-G. In a volmgnrognlntnr, the combination with a main tmmformr-r one of [he windings of which has a plurality of spaced leads, of an auxiliary transformer having one of its windings connected in series with one of the windings of the main transformer-fund means for connecting either of the terminals of the other winding of the auxiliary transformer-t0 any one of the spaced leads of the main-transfor'mer winding. v

7. In a. x'oitngeregulntm, the combination -CI)X1I!0Cl.il-l one of the terminals of the other nnxiiim-y winding to any one of the spaced :5 leads of the ninindmnsform'er winding and menusfor reversing the terminals of said'anxiliary winding.

In testimony whemot we have hereunto Subscribed on! names 111i; 7th day of Octo- 30 her, 1002.

JOHN S. PEQK. A IIARVE R. STUART. Wltnesmos:

Lanna B. Yonxo, Bmxm' 111x23. 

